Although pioneered in France, the concept of a gendarmerie was adopted by several other European nations during the Napoleonic Wars.
[1] It remains an integral part of the military establishment in most Francophone states and territories.
[1] A somewhat related phenomenon has been the formation of paramilitary units which fall under the authority of civilian police agencies.
Since these are not strictly military forces, however, they are not considered gendarmeries.
[3] 7 EU states are part of the European Gendarmerie Force, with 1 partner and 1 observer.